Study on High Performance Demolishable Grout: Material Properties and Uniaxial Tensile Behavior of Grouted Sleeve Joints
CHEN Ju1,*, ZHANG Ruiqiang1, SONG Shasha2,3
1 College of Civil Engineering and Architecture, Zhejiang University, Hangzhou 310030, China; 2 School of Civil Engineering, Shaoxing University, Shaoxing 312000, Zhejiang, China; 3 College of Civil Engineering, Tongji University, Shanghai 200092, China
Abstract: To address the challenge of repairing defects in grouted sleeve connections, a novel high-performance demolishable grout (HPDG) was proposed, and its material properties and its influence on the uniaxial tensile joint performance of grouted sleeve joints were investigated. The material properties of HPDG incorporating varying concentrations of phase change materials (i.e., polymethyl methacrylate, PMMA) were conducted, and uniaxial tensile tests on HPDG-filled grouted sleeve joints were performed under both ambient (20 ℃) and elevated (200 ℃) temperature conditions. The experimental findings demonstrated that: (i) all performance parameters of HPDG under 20 ℃ were found to comply with current regulatory standards. At 200 ℃, the phase transition of PMMA was observed to induce a porous concrete-like microstructure in HPDG, accompanied by a significant reduction in compressive strength, thereby facilitating demolition. (ii) The uniaxial tensile performance of HPDG-filled grouted sleeve joints was validated to satisfy specification requirements at 20 ℃. Under 200 ℃, failure was characterized by rebar bon-ding slippage, with the pull-out force diminishing proportionally to the compressive strength degradation of HPDG. Critically, the residual pull-out force remained below the yield load of the embedded steel reinforcement, enabling sleeve disassembly within the elastic stress range of the rebar. (iii) Through a comprehensive evaluation of strength and demolishability, the HPDG formulation containing 35% PMMA was identified as the optimal parameter configuration.
陈驹, 张瑞强, 宋沙沙. 高性能可拆除灌浆料材料性能及灌浆套筒接头单向拉伸连接性能研究[J]. 材料导报, 2026, 40(5): 25040193-6.
CHEN Ju, ZHANG Ruiqiang, SONG Shasha. Study on High Performance Demolishable Grout: Material Properties and Uniaxial Tensile Behavior of Grouted Sleeve Joints. Materials Reports, 2026, 40(5): 25040193-6.
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2026, Vol. 40 
